Furnace.



A. RoBERTsoN.

FUBNAGE. APPLIUATIO'N FILED JUNBz, 1910.

Patented J an. 16, 19112.

2 sums-SHEET 1.

/fZf/z, Inventor WZ'MM Witnesses Attorneys A. ROBERTSON.

FURNAGB.

APPLICATION FILED JUNE 2, 1910.

Patented J an.' 16, y1912.

2 SHEETS-SHEET z wwf/MMM Witnesses Inventor Attorneys ARCHIBALD ROBERTSON, 0F IDUIJUTH, MINNESOTA.

FURNACE.

Specification of Letters Patent.

Application led .Tune 2, 1910. Serial No. 564,655.

Toall whom i may concern:

Be 1t known that I, ARCHIBALD ROBERT- SON, a citizen of the United States, residing at- Duluth, in the countyo'f St. Louis 'and State of'Minnesota, have invented a new and useful Furnace, of which the following is a specification.

This invention has for its object to pro# vide in a hot air furnace a structure whereby a maximum heat radiating surface is obtained and also. to provide a furnace which is simple in construction, and economical in its consumption of fuel.v

The invention also has for its object to provide an improved damper structure for controlling the escape of the products of combustion.

With these objects in View, the invention consists in a novel construction and arrangement of parts to be hereinafter described and claimed, reference being had to the ac companying drawings, in which- Figure 1 is a central vertical section of a furnace embodying the present invention. Figs. 2, 3 and 4t are horizontal sections on the li1'1es"22, 3--3, and 1 4 respectivelyof Fig. 1. Fig. 5 is a sectional detail showing the construction of the outer shell or casing of the furnace.

In the drawing, 10 denotes a fire pot which is provided with a grate 11. Below the grate is located an ash pit 12. Above the lire pot is arranged a combustion chamber 13, said chamber being in open communication with the tire pot. The combustion chamber closed on top vby a cover 1d having a central opening from which. rises a dome 15. The products of combustion pass into this dome, and escape through a flue connected thereto. Thisue will be presently described. ,From the opening in the top 14 of the combustion .chamber 13 depends a skirting 1f, said slm-ting surrounding the opening, and its function beingh to deflect the products of combustion as will 4 be presently ports a bae plate 17 which is located below chamber.

described. This skirting sup the same within the combustion The battle plate is of substantially inverted frustoconical form, and it extends at its outer edge in close proximity to the wall' of the combustion chamber, whereby the heat is deflected against said wall. The-baille plate is 'suspended from the skirting 16 by suit-able hangers 18. Inasrnuch as this baflle plate is located beneath the outlet opening,

it will be vevident that thehproducts com# Patented jflanni',

bustion are deflected laterally lagainst the i wall of the combustion chamber near.its',`up

per end, and against thetop thereof,aft'er which 'they are deflected downwardlyibyjthe skirting 16, rand pass undertha saine, and thence upwardly into the fdoma15.`f` The products of combustionl upon strikingjthe slnrting 16 are thrown backagainstthetop 14 before passing downwardly and finali-ing their escape into the dome.v `This arrangement gives the greatest amount ofy shell radiation where the heat-is at its greatest r intensity. The baffle platel'? is cast hollow so as to serve as a water heater, the intake and outlet pipes 17a andi17", respectively extending through the shell,v of i the furnace 'to one side of the feeddoor. L A

fit-,19 is indicated the nu@ whichgjrries oft: the products of combustion, saidA flue being connected to andy-,entering the'dome 15 on one side. The flue may be connected 'to the dome at any convenient point, and it passes through the inclosingshell or,A casing of the furnace, on the outsidefof wliichconnection "1s made with asmoke pipe. The

outer end of the flue is closed by aremov'able cover 20. Within the flue is'located'; a ,plurality of transverse partitions 21 having each va central opening22 across lwhich ei;- tends a web 23. These webs support a rod 24 carrying dampers 25, and extending through the cap 20, the outer end of said rod being fitted with a suitable handle 26. The rod v24C is slidably mounted, and the dampers 25 are located on one side of the' openings 22, so that upon operating said rod, the dampers 'may be adjusted to close the openings more or less, and thus control the passage of the products of combustion through the flue 19. The arrangement of the partitions 21, and the dampers 25 provide a tortuous path for the products of combu/stion, said products upon passing through-.one of the openings 22 striking the damper behind the same, and-being thereby deflected laterally. The products then pass around the damper, and pass through the` opening in the next partition, and upon striking the next damper they are again deflected laterally, and so on throughout the entire series. This tortuous path taken by the products of combustion prevents the heat from being wasted which would be the case 'if said products were led directly into the smoke pipe. The partitions 21 are connected by rods A21a to the .cover so that the Vthis magazine is connected a chute 28 which.

extends through the outer shell or casing of the furnace, and is provided on the outside thereof with aV suitable closure 29. The magazine is supplied through lthis chute. The magazine and the chute are inclined,

, and are therefore self-feeding, and by feeding\through the chute 28, the 'fuel can be always kept alive, the gas being consumed as the fuel drops.

yOn the outside of the tire ypot 10 is a shelf -30 which supports water tanks 31 which may be kept full of water by a suitable float .valve' 32. A pipe 33 connects the tanks so that a single float valve will operate to fill both'tanks. The tanks partly surround the ire pot as sh'ownin Fig. 2.

At 34 is indicated the shell or inclosing casing of the furnace, said shell having a fresn air inlet 35 at the bottom, and an out-l let 36 at the top', the hot air escaping from said outlet, and being carried by suitable flues to the various rooms or other laces`to be heated.' `T he casing has a door 3 located over `an opening in the combustion chamber 13, and also a door 38 through which access may be had to there pot 10, as well an ash pit door 39', and a man-hole door 40 on the side; The casing 34 isl made of two `thicknesses of sheet metal with a layer of vcorrugated asbestos insulating paper therebetween, said layer being indicated at 41. By thus insulating the 'casing of the furnace, the heat is prevented from being wasted by radiation, and it isheld in the casing, and made humid therein by evaporation of the water in the tanks 31. f The heated and moistened air passes out of the casing through the outlet 36 and is then conducted to the various rooms or other places to be heated. The joint between the top and side walls of the casing is made by bending the upper ends of the side walls outwardly to form a horizontal ange, and bolting the top to'said -lange as indicated at 42. A channel shaped strip 43 is placed over the edges of the flange and the top, through the flanges of which strip the bolts 42 pass.

What is claimed is:

In a furnace, a fire pot, a combustion chamber above the same and having a cen-y tral opening in its top, a ,dome rising from the opening, a smoke outlet connected to the dome, a skirting depending from the opening, a battle plate spaced from the skirting and comprising a frusto-c'onical plate located belowthe skirting and extending at its edge in close proximity to the wall ofthe` combustion'chamber, a fuel magazine in the combustion chamber and passing through and supported by the baffle plate, and a Jfuel chute lleading to the magazine.

In testimony that I claim the foregoing as my own, I have hereto aiiixed my slgnature in the presence of two witnesses.

ARCHIBALD ROBERTSON.

Witnesses:

J. B. GnEENrmm, W. J. GREENFIELD. 

